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Date: Mon, 17 Jan 2022 21:16:55 -0500 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Yang Li <yang.lee@...ux.alibaba.com>, Abaci Robot <abaci@...ux.alibaba.com>, Geert Uytterhoeven <geert+renesas@...der.be>, Sergey Shtylyov <s.shtylyov@....ru>, Jakub Kicinski <kuba@...nel.org>, Sasha Levin <sashal@...nel.org>, davem@...emloft.net, biju.das.jz@...renesas.com, prabhakar.mahadev-lad.rj@...renesas.com, yoshihiro.shimoda.uh@...esas.com, netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org Subject: [PATCH AUTOSEL 5.16 052/217] ethernet: renesas: Use div64_ul instead of do_div From: Yang Li <yang.lee@...ux.alibaba.com> [ Upstream commit d9f31aeaa1e5aefa68130878af3c3513d41c1e2d ] do_div() does a 64-by-32 division. Here the divisor is an unsigned long which on some platforms is 64 bit wide. So use div64_ul instead of do_div to avoid a possible truncation. Eliminate the following coccicheck warning: ./drivers/net/ethernet/renesas/ravb_main.c:2492:1-7: WARNING: do_div() does a 64-by-32 division, please consider using div64_ul instead. Reported-by: Abaci Robot <abaci@...ux.alibaba.com> Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be> Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru> Link: https://lore.kernel.org/r/1637228883-100100-1-git-send-email-yang.lee@linux.alibaba.com Signed-off-by: Jakub Kicinski <kuba@...nel.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/net/ethernet/renesas/ravb_main.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index b4c597f4040c8..151cce2fe36d5 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -30,8 +30,7 @@ #include <linux/spinlock.h> #include <linux/sys_soc.h> #include <linux/reset.h> - -#include <asm/div64.h> +#include <linux/math64.h> #include "ravb.h" @@ -2488,8 +2487,7 @@ static int ravb_set_gti(struct net_device *ndev) if (!rate) return -EINVAL; - inc = 1000000000ULL << 20; - do_div(inc, rate); + inc = div64_ul(1000000000ULL << 20, rate); if (inc < GTI_TIV_MIN || inc > GTI_TIV_MAX) { dev_err(dev, "gti.tiv increment 0x%llx is outside the range 0x%x - 0x%x\n", -- 2.34.1
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